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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65b36714e306073be31564f9797c92998ec2b3ea573a79fa75d570117a7f3cb2' 
  AND token = 'urMbBxuZNoMZNwtn7X3jJKM5jFo79eW83/HO2EqfweI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}